* {
    margin: 0;
    padding: 0;
}

a {
    text-decoration: none;
}

ul {
    list-style: none;
}

.header {
    width: 1280px;
    height: 75px;
    margin: 0 auto;
}

.logo {
    float: left;
    width: 105px;
    height: 45px;
}

.logo img {
    width: 105px;
    height: 45px;
}

.nav {
    width: fit-content;
    float: right;
}

.nav-item {
    position: relative;
    float: left;
    margin-top: 17px;
    margin-right: 30px;
    color: #fff;
}

.nav-item a {
    color: #fff;
}

.nav-item img {
    position: absolute;
    width: 198px;
    height: 28px;
    top: 23px;
    left: -40px;
}

.nav-item span {
    position: absolute;
    display: block;
    width: 198px;
    height: 28px;
    color: #fff;
    font-size: 14px;
    text-align: center;
    line-height: 28px;
    top: 27px;
    left: -40px;
    cursor: pointer;
}

.main {
    position: relative;
    width: 1280px;
    height: 550px;
    margin: 0 auto;
}

.main-c {
    position: absolute;
    width: 450px;
    height: 80px;
    right: 0;
    bottom: 56%;
}

.main-c img {
    width: 450px;
    height: 80px;
}

.dowload {
    position: absolute;
    width: 370px;
    height: 52px;
    right: 0;
    bottom: 43%;
}

.iphone,
.android {
    position: relative;
    float: left;
    width: 142px;
    height: 52px;
    margin-right: 10px;
}

.code {
    float: left;
    width: 52px;
    height: 52px;
}

.iphone img,
.android img {
    width: 142px;
    height: 52px;
    border-radius: 8px;
    cursor: pointer;
}

.code img {
    width: 52px;
    height: 52px;
    border-radius: 8px;
}

.mask-iphone {
    position: absolute;
    width: 142px;
    height: 52px;
    top: 0px;
    display: none;
    cursor: pointer;
    background-color: rgba(0, 0, 0, .3)
}

.iphone:hover .mask-iphone {
    display: block;
}

.android:hover .mask-iphone {
    display: block;
}

.fullscreenvideo {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    z-index: -100;
    -webkit-transform: translateX(-50%) translateY(-50%);
    transform: translateX(-50%) translateY(-50%);
    -webkit-transition: 1s opacity;
    transition: 1s opacity;
}

.videocontainer {
    position: fixed;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -100;
}

.videocontainer:before {
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    display: block;
    z-index: -1;
    top: 0;
    left: 0;
}

.footer {
    width: 100%;
    height: 100px;
}

.nav-warpper {
    width: fit-content;
    height: 19.2px;
    margin: 0 auto;
    color: #fff;
    text-shadow: 0 1px 2px rgba(0, 0, 0, .4);
    margin-bottom: 16px;
}

.nav-warpper a {
    color: #fff;
    font-size: 14px;
    padding: 0 5px;
}

.copy-year,
.allow {
    text-align: center;
    color: #fff;
    font-size: 14px;
    line-height: 25px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, .4);
}

.bottom {
    width: fit-content;
    height: 20px;
    margin: 0 auto;
    color: #fff;
    font-size: 14px;
}

.bottom a {
    color: #fff;
}